2145443121 has 24 divisors (see below), whose sum is σ = 3341651040. Its totient is φ = 1321963200.

The previous prime is 2145443119. The next prime is 2145443143. The reversal of 2145443121 is 1213445412.

2145443121 is a `hidden beast` number, since 214 + 5 + 443 + 1 + 2 + 1 = 666.

It is not a de Polignac number, because 2145443121 - 2¹ = 2145443119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2145443101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145995 + ... + 160016.

It is an arithmetic number, because the mean of its divisors is an integer number (139235460).

Almost surely, 2^2145443121 is an apocalyptic number.

It is an amenable number.

2145443121 is a deficient number, since it is larger than the sum of its proper divisors (1196207919).

2145443121 is a wasteful number, since it uses less digits than its factorization.

2145443121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306077 (or 306074 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 2145443121 is about 46318.9283230949. The cubic root of 2145443121 is about 1289.7503915826.

Adding to 2145443121 its reverse (1213445412), we get a palindrome (3358888533).

The spelling of 2145443121 in words is "two billion, one hundred forty-five million, four hundred forty-three thousand, one hundred twenty-one".